SP 4277
E676844
SP 4277 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s powerful cab-forward freight and passenger engine fleet.
All labels observed (1)
| Label | Occurrences |
|---|---|
| SP 4277 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7429211 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: SP 4277 Context triple: [AC-11, fleetNumbers, SP 4277]
-
A.
SP 4274
SP 4274 is a Southern Pacific Railroad locomotive, specifically an EMD AC-11 class cab-forward steam engine used for heavy freight service.
-
B.
SP 4273
SP 4273 is a specific Southern Pacific Railroad locomotive, identified by its road number within the railroad’s locomotive roster.
-
C.
SP 4271
SP 4271 is a Southern Pacific Railroad locomotive, preserved as part of the railroad’s historic diesel-electric fleet.
-
D.
SP 4272
SP 4272 is a Southern Pacific Railroad locomotive, specifically an AC-11 class cab-forward steam engine used for heavy freight service.
-
E.
SP 4257
SP 4257 is a preserved Southern Pacific AC-11 class articulated steam locomotive, notable as one of the railroad’s powerful cab-forward engines used in heavy freight service.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: SP 4277 Target entity description: SP 4277 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s powerful cab-forward freight and passenger engine fleet.
-
A.
SP 4274
SP 4274 is a Southern Pacific Railroad locomotive, specifically an EMD AC-11 class cab-forward steam engine used for heavy freight service.
-
B.
SP 4273
SP 4273 is a specific Southern Pacific Railroad locomotive, identified by its road number within the railroad’s locomotive roster.
-
C.
SP 4271
SP 4271 is a Southern Pacific Railroad locomotive, preserved as part of the railroad’s historic diesel-electric fleet.
-
D.
SP 4272
SP 4272 is a Southern Pacific Railroad locomotive, specifically an AC-11 class cab-forward steam engine used for heavy freight service.
-
E.
SP 4257
SP 4257 is a preserved Southern Pacific AC-11 class articulated steam locomotive, notable as one of the railroad’s powerful cab-forward engines used in heavy freight service.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
Southern Pacific AC-11 steam locomotive
ⓘ
articulated steam locomotive ⓘ cab-forward steam locomotive ⓘ |
| builder | Baldwin Locomotive Works NERFINISHED ⓘ |
| class | Southern Pacific AC-11 NERFINISHED ⓘ |
| configuration | 4-8-8-2 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designFeature |
articulated frame
ⓘ
cab-forward layout ⓘ oil-fired boiler ⓘ simple expansion ⓘ |
| family | Southern Pacific cab-forward locomotives NERFINISHED ⓘ |
| fleetNumber | 4277 ⓘ |
| gauge |
4 ft 8 1⁄2 in
ⓘ
standard gauge ⓘ |
| locomotiveClassPosition | member of AC-11 subclass of Southern Pacific cab-forwards ⓘ |
| notableFor |
heavy mountain freight operations
ⓘ
operation through long tunnels and snow sheds ⓘ |
| operator | Southern Pacific Railroad NERFINISHED ⓘ |
| powerType | steam ⓘ |
| railwayCompany | Southern Pacific NERFINISHED ⓘ |
| railwayLineServed | Southern Pacific Railroad system NERFINISHED ⓘ |
| railwayRegion |
Cascade Range routes
ⓘ
Sierra Nevada routes ⓘ Western United States NERFINISHED ⓘ |
| traction | adhesion ⓘ |
| UICClassification | (2′D)D2′ h4 ⓘ |
| use |
freight service
ⓘ
passenger service ⓘ |
| WhyteType | 4-8-8-2 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: SP 4277 Description of subject: SP 4277 is a Southern Pacific Railroad AC-11 class articulated steam locomotive, part of the railroad’s powerful cab-forward freight and passenger engine fleet.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.